public final class IndexedFilterExpression extends Expression implements ContextSwitchingExpression
EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, EVENT_FEED_METHOD, INHERITED_CONTEXT, INSPECTION_CONTEXT, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, NAVIGATION_CONTEXT, NODE_VALUE_CONTEXT, PROCESS_METHOD, PUSH_SELECTION, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, W3C_CONSUMING, W3C_FREE_RANGING, W3C_GROUP_CONSUMING, W3C_MOTIONLESS, WATCH_METHOD| Constructor and Description |
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IndexedFilterExpression(VariableReference start,
ComparisonExpression filter,
boolean indexFirstOperand)
Constructor
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| Modifier and Type | Method and Description |
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int |
computeCardinality()
Get the static cardinality of this expression
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int |
computeDependencies()
Determine which aspects of the context the expression depends on.
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int |
computeSpecialProperties()
Get the static properties of this expression (other than its type).
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Expression |
copy()
Copy an expression.
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boolean |
equals(Object other)
Is this expression the same as another expression?
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void |
explain(ExpressionPresenter out)
Diagnostic print of expression structure.
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VariableReference |
getBaseExpression()
Get the underlying expression
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Expression |
getControlledExpression()
Get the subexpression that is evaluated in the new context
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Expression |
getControllingExpression()
Get the subexpression that sets the context item
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ExpressionCompiler |
getExpressionCompiler()
Return the compiler of the IndexedFilter expression
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ComparisonExpression |
getFilter()
Get the filter expression
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ItemType |
getItemType(TypeHierarchy th)
Get the data type of the items returned
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Expression |
getSearchExpression()
Get the expression whose value we will be searching for
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Expression |
getUseExpression()
Get the expression to be indexed
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int |
hashCode()
get HashCode for comparing two expressions
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SequenceIterator<? extends Item> |
iterate(XPathContext context)
Iterate over the results, returning them in the correct order
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Iterator<SubExpressionInfo> |
iterateSubExpressionInfo()
Get the immediate sub-expressions of this expression, with information about the relationship
of each expression to its parent expression.
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Iterator<Expression> |
iterateSubExpressions()
Get the immediate subexpressions of this expression
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Expression |
optimize(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Perform optimisation of an expression and its subexpressions.
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Expression |
promote(PromotionOffer offer,
Expression parent)
Promote this expression if possible
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boolean |
replaceSubExpression(Expression original,
Expression replacement)
Replace one subexpression by a replacement subexpression
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Expression |
typeCheck(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Type-check the expression
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addToPathMap, adoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, computeStaticProperties, doPromotion, dynamicError, effectiveBooleanValue, evaluateAsString, evaluateItem, evaluatePendingUpdates, explain, getCardinality, getColumnNumber, getColumnNumber, getConstructType, getContainer, getDependencies, getEvaluationMethod, getExecutable, getExpressionName, getHostLanguage, getImplementationMethod, getIntegerBounds, getIntrinsicDependencies, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getObjectName, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getStreamability, getStreamingAdjunct, getSystemId, getSystemId, hasVariableBinding, implementsStaticTypeCheck, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, iterateEvents, markTailFunctionCalls, process, resetLocalStaticProperties, setContainer, setEvaluationMethod, setFiltered, setFlattened, setLocationId, simplify, staticTypeCheck, suppressValidation, toPattern, toStreamingPattern, toString, typeErrorpublic IndexedFilterExpression(VariableReference start, ComparisonExpression filter, boolean indexFirstOperand)
start - Variable containing the sequence of items from which the selection will take place.filter - An expression defining the filter predicateindexFirstOperand - true if the first operand of the filter comparison is to be indexed, false
if the second operand is to be indexedpublic ItemType getItemType(TypeHierarchy th)
getItemType in class Expressionth - the type hierarchy cachepublic VariableReference getBaseExpression()
public ComparisonExpression getFilter()
public Expression getControllingExpression()
getControllingExpression in interface ContextSwitchingExpressionpublic Expression getControlledExpression()
getControlledExpression in interface ContextSwitchingExpressionpublic Expression getUseExpression()
public Expression getSearchExpression()
public Expression typeCheck(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
typeCheck in class Expressionvisitor - an expression visitorcontextItemType - the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPEXPathException - if an error is discovered during this phase
(typically a type error)public Expression optimize(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType)
This method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.
optimize in class Expressionvisitor - an expression visitorcontextItemType - the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPEpublic Expression copy()
copy in class Expressionpublic Expression promote(PromotionOffer offer, Expression parent) throws XPathException
promote in class Expressionoffer - details of the promotion that is possibleparent - XPathException - if any error is detectedpublic Iterator<Expression> iterateSubExpressions()
iterateSubExpressions in class Expressionpublic Iterator<SubExpressionInfo> iterateSubExpressionInfo()
iterateSubExpressionInfo in class Expressionpublic boolean replaceSubExpression(Expression original, Expression replacement)
replaceSubExpression in class Expressionoriginal - the original subexpressionreplacement - the replacement subexpressionpublic int computeCardinality()
computeCardinality in class Expressionpublic int computeSpecialProperties()
computeSpecialProperties in class Expressionpublic boolean equals(Object other)
public int hashCode()
public SequenceIterator<? extends Item> iterate(XPathContext context) throws XPathException
iterate in class Expressioncontext - the dynamic context for the evaluationXPathException - if any dynamic error occurspublic int computeDependencies()
computeDependencies in class Expressionpublic ExpressionCompiler getExpressionCompiler()
getExpressionCompiler in class Expressionpublic void explain(ExpressionPresenter out)
explain in class Expressionout - the expression presenter used to display the structureCopyright (c) 2004-2013 Saxonica Limited. All rights reserved.